Do you have Sub Summary layout parts as well?
If so, you have encountered a known issue with sliding fields and sub summary layout parts.
For More Information see: Frustrating subsummary bug
This is one of many acknowledged bugs that can be found in the Known Bug List thread here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: https://www.dropbox.com/s/jt09b82i0xijbu3/FMP%20Bugs.zip
I do not have any Sub Summary parts int he report.
Then you'll need to look closer at your layout design. Do you have any other objects in the body of your layout next to or below these sliding fields? Event a graphic object such as a horizontal line could be the culprit. Any layout objects, buttons, pictures, lines.... that are mixed in with or below the sliding fields also need to be set to slide up and resize the enclosing part.
Nothing is below my last item (which is a container).
I do have some labels that are not sliders since I want them to start at the top of a page (e.g., 1.0 Section 1, 5.0 Appendix,..) and I cannot insert a page break (that I know of). So I just made these section headers non-sliders but everything else is a slider. The sliding seems to be owrking except for the blank pages at the end.
Are you sure that the container field is actually sliding? It won't slide up unless you select that field in layout mode and use the data formatting controls in on the Inspector's data tab to select "top alignment" for that field.
Bingo!!! U da man. That was it. Thanks!